Hi Jean,
Thank you for the swift reply.
I did as you said and started a new project, this time instead of adding Ugui, I depended on UI actions that comes from your latest Playmaker packages. It worked very well and UI actions are meeting most of the requirements. (I had to create a few UI versions of custom UGUI actions on Ecosystem, for example UGUI to Worldpoint)
No error or clash until now. I will test further (especially the variables, when I create new ones, they shouldn't change existing variables that are set) and if any new bug happens, I will post here again. Thanks.